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Another form of scope canting is caused by the rings themselves. Many Weaver-type mounts, including many Picatinny-type scope rings and even the Redfield Type, have either two or four screws on top of the scope ring that hold the scope in place. Both the Weaver and Picatinny clamp systems have a screw side and a clamp side.
A hold-down may also refer to clamping device used to anchor a pipe to a structural steel element or concrete floor or allow movement of the pipe in an axial direction. [1] At the bottom, the hold down is connected to the concrete foundation or structural slab by an embedded or epoxied anchor bolt. At the top, the hold down is connected to a ...
A machinist square or engineer's square is the metalworkers' equivalent of a try square.It consists of a steel blade inserted and either welded or pinned into a heavier body at an angle of 90°.
Visualise bending the left end of the pipe up 88 degrees. Now turn the piece of pipe around so the horizontal piece of pipe is in line with the zero degrees line on the protractor. The protractor will read 92 degrees. The key point is that the plumbing term focuses on the degree of bend from the original straight pipe, not the resulting angle.
The spring spike holds the rail down and prevents tipping and also secures the baseplate to the sleeper. [26] The Macbeth spike (trade name) is a two-pronged U-shaped staple-like spike bent so that it appears M-shaped when viewed from the side. [27] [28] Inverted J-shaped single pointed spikes have also been used. [29]
A set of three gimbals mounted together to allow three degrees of freedom: roll, pitch and yaw. When two gimbals rotate around the same axis, the system loses one degree of freedom. Normal situation: the three gimbals are independent Gimbal lock: two out of the three gimbals are in the same plane, one degree of freedom is lost
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